Confidence:StrongSolidPlausibleTentativeSpeculative

• Grindstone✓

  1

  ArtifactC

  Alternate win condition: one card wins on a state the other reliably produces (empty library, infinite life, etc.).
• Reanimate

  B

  SorceryB

  Reanimate puts Painter's Servant onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Helping Hand

  W

  SorceryW

  Helping Hand puts Painter's Servant onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Unearth

  B

  SorceryB

  Unearth puts Painter's Servant onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Grave Researcher // Reanimate

  2BB

  Creature — Troll Warlock // SorceryB

  Grave Researcher puts Painter's Servant onto the battlefield from a graveyard without casting it, so its mana cost is never paid.